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tire pressure question

Discussion in 'The Garage' started by big83chevy4x4, Jul 13, 2004.

  1. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    right now i have 265/57x16s mounted on 16x7 rims and i run 65psi (rated) on the street and 10 in the sand and about 15-20 in the mud/trails.

    i got my 35x12.5 mounted on my 15x10 8lug rims /forums/images/graemlins/woot.gif /forums/images/graemlins/woot.gif
    i know that with a bigger tire the tire pressure changes.

    i can always play with the offroad pressure, but the street eats the tires too fast is there not correct.

    what pressure do you think i should run on the street? sand? mud/trails?
     
  2. 84gmcjimmy

    84gmcjimmy 1 ton status

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    For street run what is recommend on the sidewall.
    for sand run as low as you can with out blowing the bead
    and for trails/mud run around maybe 20psi /forums/images/graemlins/dunno.gif
     
  3. az-k5

    az-k5 1/2 ton status

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    On the 35's I would keep them around 30psi on 10" and 25psi on 8". I work at a tire shop (DTC) and we have pain in the azz to read charts that cross this as best. I have also personally run 35psi, 30psi, 25psi, on both 10" and 8" as well. I find the above to be best for my application. Just don't load the tire down when it is below 30psi as it will heat up real fast (BOOM). The 35's are probably max at 35psi to begin with.
     
  4. m j

    m j 1/2 ton status

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    my Michelins recommend 80psi on the sidewall
    no thanks
    they ride rough enough at 40psi
    they ride great at 24 psi but I am chicken of wearing them out down there
    hard to find them again
     
  5. m j

    m j 1/2 ton status

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    any distance driving you need higher air pressure
    local stuff you are not going to overheat the tire
    now how often do you wanna air up n down?
    an IR temp meter would be cool to play with in chacking tire temps at various pressure
     
  6. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Don't know about narrow tires like 12.50 but with my boggers I just inflate them to 30 psi and start letting air out until the tread just starts to sit flat across the cement floor for best wear.
     
  7. m j

    m j 1/2 ton status

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    what makes you think that will wear 'best'?
    'most even' yes, but maybe 'fastest' also.
     
  8. az-k5

    az-k5 1/2 ton status

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    Skinny tires are the same. Make them run flat across the ground.
     
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    its on my DD, so i drive on the road quite a bit. to play in the real stuff (not "dirt roads") i have to drive at least 1.5 hours, the next nearest is 2 hours the other way.

    i air up/down aprox every two weeks-a month.

    so you think 30psi on the street even with the bikes in the back? most weight i put in the back is about 1500 lbs (my cr500 (240lbs) my dads xr600 (350lbs) and my moms xr200 (220lbs) 3 people, gas and gear) and drive 2 hours.
     
  10. az-k5

    az-k5 1/2 ton status

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    30 should be fine for that. Look at the side wall raiting on the tires for weight and multiply that by .85 <- (30/35) that is roughly how much weight they can handle at that pressure.
     
  11. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    what makes you think that will wear 'best'?
    'most even' yes, but maybe 'fastest' also.

    [/ QUOTE ]
    You are probably going to go into some long speel about how I'm wrong but I have heard from a lot of people and from my experience is that with a wide swamper having all of the tread width on the ground promotes the best and longest wear because they are not riding on the center of the tire..at enough PSI of course.
     
  12. mcinfantry

    mcinfantry 1/2 ton status

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    [ QUOTE ]
    what makes you think that will wear 'best'?
    'most even' yes, but maybe 'fastest' also.

    [/ QUOTE ]

    mj check the air pressure "hot" if they go up 10% or more you need more air.
    i run 60psi on road, 10psi off, i could go 0psi (beadlocks) but i havent needed it yet
     
  13. az-k5

    az-k5 1/2 ton status

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    Okay, running my K5 for an hour and a half at 70mph put the warm air pressure up to 30 psi (started at 25psi cold). I use to run them at 35 psi (max) and after driving the same road in the same conditions it would be 40psi warm. Doesn't really phase me. I have been doing it for 2 years now and no problems to speek of yet.
     
  14. 84_Chevy_K10

    84_Chevy_K10 Banned

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    For long highway runs I used to run the Swampers at 25 PSI.

    Usually 20 for in town and highway runs 1 hour or less.

    Now they never have more than 10-11 PSI in them as the rig is trailer trash.
     
  15. 6.2Blazer

    6.2Blazer 1/2 ton status

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    [ QUOTE ]
    For street run what is recommend on the sidewall.

    [/ QUOTE ]

    The pressure listed on the sidewall is not a "recommended" pressure for everyday driving....rather it's the maximum allowable pressure for the tire when it has the maximum load on it.

    In the original post he mentions the sidewall says 65 psi on a 265/75R16. Based on this I'm guessings it is an "LT" tire with a "D" load range, and therefore probably has a load rating of at least 2,500 lbs. per tire. That means that all 4 tires at max pressure can support 10,000 lbs.......your truck obviously doesn't weigh anywhere close to that much when empty so there is no reason to run that much air pressure. Running too high of pressure will cause a rough ride and will wear the center of the tread.

    Just as a quick fact regarding larger tires requiring different pressures.......it's the VOLUME of air in the tire that determines how much weight it can support, not the pressure. That's why a larger size tire requires less pressure to support the same weight.
     
  16. 84gmcjimmy

    84gmcjimmy 1 ton status

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    okay 6.2, thanks for the correction /forums/images/graemlins/bow.gif
     
  17. 88sub4x4

    88sub4x4 1/2 ton status

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    muddytaz put up a post a few months ago that covered this issue really well. I followed what the article said and my tires have worn excellent. Very even and very little wear. If you PM him he may still have the link to it.
     
  18. boggerless

    boggerless 1 ton status Premium Member

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    this i can agree with.i used iterco's recomendation and they wear to fast in the center(boggers that is).one thing i will say is boggers can hold some serious weight. i carry between 2200lbs and 4100lbs in my DD all the time.and aired up to 25 pounds each they don't squat at all. /forums/images/graemlins/k5.gifto /forums/images/graemlins/truck.gif
     
  19. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    max load for each tire is 2555 at 35 psi. ill try 30 and see how it looks. /forums/images/graemlins/waytogo.gif
     

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